Improvement in grinding-machines



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Letters Patent No. 101,559, dated April 5, 1870.

IMPROVEMENT IN GRINDING-MACHINES.

' The Schedule referred to in these Lettera Patent and making part ofthe same.

To all whom it may concern:

Beit known that THOMAS H. WORRALL, of East Blackstone, Worcester county, Massachusetts, have invented a new and useful Improvement in Grinding- Machine and I do hereby decla-re that the following is a full, clear, and exact desciiption thereof, which will enable others skilled in the art to make and use the same, reference'being had to the accompanying dra-wings forming part of this specification, in which- Figure 1 is a front view of my improved grindinginachine, parts being broken away to show the construction.

Figure 2 is a detail top view of one of the projections to support the rest.

Figure 3 is a det-ail top view of the Hat surface rest.

My invention has for its object to furnish an irnproved machine for running solid emery-Wheels, which shall besimple in construction, compact, and strong; and

1t consists in the construction and combination of the various parts ofthe machine, as hereinafter more fully described.

A is the cast-iron frame or stand, which is cast hollow and with a bearing, a', at eac-h end, to receive the spindle.

B are two projections, cast solid upon the upper part of the front side of the fralneA, to receive the adjustable stand C for the rest.

The projections B are slotted to receive the bolt by which the stand O is clamped to the said projections B, so that the rest may be moved toward or from the machine, as may be desired.v

The head of the clamping-bolt enters a dovetailed groove in the under side of thebase-plate of the stand C, to enable the said stand to be adjusted as the form or character of the thing to be ground may require.

In one end ofthe stand G is formed a socket, c', to receive the shank ofthe rest, where it may be secured at any desired elevation by a set-screw D is the spindle, 'which revolves in brass or other composition boxes in the bearings a' of the fra-me A.

'E is the pulley, which may be a plain or a conepulley, as may be desired, and which is secured to the middle part of the spindle D by a set-screw passing through the hub of said pulley, and the joint ot' which enters a recess in the said spindle.

The spindle D is made of the same size throughout, and is kept from moving longitudinally in its bearings by the collar F, secured to it by a set-screw, the forward end of which enters a spiral groove, d', in the said spindle D, so that the said collar may be adjusted to compensate,v for the wear.

G are flanges or collars, formed upon or rigidly attached to the end posts of the spindle D, for the emery-wheels to rest against, where they are secured in place by the movable anges or washers H and nuts I.

The thread of the nut I, upon one end of the spindle D, is a right-hand screw-thread, and the one upon the other end of said spindle is a left-hand screw-thread, so that the emery-wheels may not become loose when 1n use.

J is a dat-surface rest, which is made in the forni shown in figs. 3 and 4, and the stem or shank of which is adjustably secured in the socket of the rest-stand C, in the manner hereinbcfore describedy with -reference to the ordinary rest, so that it may be adjusted as required.

The rest J is designed for use in grinding the sides of nuts square with their faces, and for other purposes.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- 1. The hollow cast-iron stand or frame, consisting of the parts A a and slotted projections B, as shown and described.

2. .The spindle D, having spiral grooved, pulley E, adjustable collar F, and frame A a', all combined and relatively constructed and arranged, as set forth.

llHOS. H. WORRALL.

Titnessesz FRED. L. SMITH, JEREMIAH GA'rcHELL. 

